please try to upgrade to 4.2.2 manually. it fixed a few mod_security bugs and likely including yours.

#cd /usr/local/lsws/admin/misc
#./lsup.sh -v 4.2.2

Click to expand...

Thank you very much for answer
I upgraded lsws to 4.2.2 and restarted server but still problem not resolved!
Also i received this email

Sub: Web server *** on *** is automatically restarted
Body: At [10/Feb/2013:01:57:11 +0330], web server with pid=16462 received unexpected signal=11, a core file is created. A new instance of web server will be started automatically!